*{
    margin: 0;
    padding: 0;
}
body{
    background-color: rgb(236, 141, 25);
}
.box{
    width: 200px;
    height: 200px;
    background: url(./tou3.jpg) no-repeat center;
    background-size: cover;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}
.box::before,.box::after{
    content: '';
    border: 2px solid #fff;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: -15px;
    clip: rect(0px,0px,0px,0px);
    animation: borderClip 4s linear infinite;
    -webkit-animation: borderClip 4s linear infinite;
}
.box::after{
    animation-delay: -2s;
}
.box:hover::before,.box:hover::after{
    animation-play-state: paused;
}
@-webkit-keyframes borderClip{
    0%{
        clip: rect(0px,230px,2px,0px);
    }
    25%{
        clip: rect(0px,2px,230px,0px);
    }
    50%{
        clip: rect(228px,230px,230px,0px);
    }
    75%{
        clip: rect(0px,230px,230px,228px);
    }
    100%{
        clip: rect(0px,230px,2px,0px);
    }
}
@keyframes borderClip {
    0%{
        clip: rect(0px,230px,2px,0px);
    }
    25%{
        clip: rect(0px,2px,230px,0px);
    }
    50%{
        clip: rect(228px,230px,230px,0px);
    }
    75%{
        clip: rect(0px,230px,230px,228px);
    }
    100%{
        clip: rect(0px,230px,2px,0px);
    }
}